Ventilating apparatus.



VENTILAUNG APPARATUS. APPLICATION FILED MAR. 3, 1914- Pavtented July 3, E911?,

INVENTOR v jy?" Q" ATTORNEY WITNESSES: www 7 UNITED STATES PATENT GFFICE.

JAN ARTHUR KUYSER, OF EDGEWOOL, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

VENTILATING APPARATUS.

Application led March 3, 1914.

To all whom t may concern:

Be it known that I, JAN ARTHUR Knysna, a subject of the Queen of Holland, and a resident of Edgewood, in the county of Alleglieny and State of Pennsylvania, have invented a new and useful Improvement in Ventilating Apparatus, of which the following is a specification.

My invention relates to Ventilating apparatus, and it has special reference to ventilating devices especially adapted for use in connection with dynamo-electric machines, such as large turbo-generators and the like.

One object of my invention is to provide a novel and efficient ventilating apparatus which will deliver relatively large volumes of air with the use of fans of relatively small dimensions.

Another object of my invention is to provide a large dynamo-electric machine with ventilating means capable of delivering suficient air for cooling the machine without increasing unduly the size or the peripheral speed of the blowing fans.

In the accompanying drawing, Figure l is a longitudinal sectional view of a portion of a dynamo-electric machine equipped with my improved ventilating device, and Fig. 2 is an end elevational view, with parts broken away, of the apparatus shown in Fig. 1.

Certain large dynamo-electric machines, such as high-speed turbo-generators, develop more heat during their operation than can be dissipated by the air currents normally set up by the rotating parts. Additional ventilating means are therefore necessary in order to cool the machine sufficiently to permit it to be run at the high speed Anecessarily incident to the production of high power. As the size and the speed of rotation of these machines increase, it is necessary to increase proportionately the size of the centrifugal fans which are ordinarily employed, but it is found that the diameter of the fans can be increased only within certain Awell-defined limits, which are determined by the ability of the fans to with stand 'the centrifugal force developed in the rotation of the machinei Specification of Letters Patent.

Patented J nly 3, 1917.

Serial No. 822,206.

It is my purpose to supply larger quantities of cooling air to machines of the above indicated character than can be delivered by a single fan mounted to rotate with the shaft of the machine. This result can, of course, be obtained by the use of separately driven blowers, but such an arrangement entails an undesirable loss of power, and it is furthermore not available in situations where self-contained blowers are desired. I have devised an arrangement wherein a plurality of blowers are mounted on the shaft of the machine to be cooled, and are provided with means for guiding the air currents which they produce t0 the s ame air chamber; that is to say, to the main body of the end casing of the machine.

For a better understanding of my invention, reference may now be had to the accompanying drawing. rThe parts of a dynamo-electric machine there shown comprise a rotor l, a stator 2, having coils provided with the usual end turns 3, and an end-bell or casing 4. Mounted on the shaft 5 of the rotor l, is a centrifugal blower G, composed of a series of fan blades radially secured to the shaft and rotating with it. The structure described up to this point is well known in the art, and is described merely to facilitate a better understanding of my invention.

A second blower 7, similar in construction to the blower 6, is similarly mounted for rotation with the shaft 5. rIhese two blowers will, of course, deliver twice the volume of air delivered by the fan 6 alone; but the mere duplication of the fans is not sufficient to increase the amount of air actually applied to the parts to be cooled, because, as the air inlet to the blower is ordinarily arranged, both of the blowers cannot be supplied with sufficient air, and the blasts from both blowers can not be delivn ered to the same air chamber without interference between the inlet currents and the several discharge currents. It is therefore necessary to provide means for properly uiding the inlet and discharge currents.

In the form of the device shown in the drawing., auch guiding means comprise a 'loo common air channel or duct 8, communicating with the atmosphere and with the inlet-s of both blowers, and a partition 9, of generally semicylindrical form, which is disposed between lthe two fans and partly encircles the shaft V5, in the manner indicated in Fig. 2. A second partition l0, extending from the partition 9 upward to the top of the end bell and downward to a point adjacent to the blower 6, is provided with openings ll through which air from the'blower 7 is delivered into the upper part of the end bell.

Air from the blower 7 is prevented from escaping to the outer atmosphere by an end casing 12 which is secured to the end bell -i and cooperates with the blower 7 in the manner shown in Fig. 1. The directions of the air currents to and from the respective blowers are shown by arrows in Fig. l.

The structure shown and described is preferably duplicated at the other end of the machine.

lt willbe evident from the foregoing description, and from the drawing, that the air currents produced by the extra blower 7 are not permitted to'interfere with the currents delivered to and from the usual blower 6, but that they' are delivered to a predetermined part of the mechanism of the machine, which, in the structure shown, is the upper part of the stator Q. It is obvious that these currents may be delivered to other portions of the stator by suitably modifying the location of the air duct ll, the partitions 8 and 9, and the ports 10.

y my novel device, blowers of a given size may be used with much larger machines than has heretofore been possible, and conversely, for machines of a given size, blowers of' similar diameter may be used. This reduction in the diameter and relative peripheral speed of the blowers resultsin an increased economy in their operation and, consequently, in a high commercial eiiiciency of the generator.

It is obvious that numerous modifications may be made in the structure which I have shown and described without departing from the spirit and scope of my invention, and I therefore desireV that no limitations shall be imposed unless indicated in the appended claims.

I claim as my invention:

l. Ventilating apparatus comprising a casing, a shaft extending therethrough, a plurality of means associated with'the said shaft for producing air currents, and means associated with the said casing for simultaneously supplying 'air from an exterior source of supply to a plurality of the said current-producing means, and for guiding the several air currents in independent paths to the interior of the casing;

2; Ventilating apparatus comprising a casing, a shaft extending therethrough, a pluralit T of sets of fan blades mounted on the shaft and adapted to rotate therewith, a joint air inlet passage for said sets of fan blades and means for guiding and delivering the several air currents to different portions of the interior of the casing. l

3. The combination with a dynamo-electric machine provided with an end-bell and a shaft extending therethrough, of a plurality of means associated with the said shaft for producing air currents, a joint air inlet passage for supplying said means and means associated with the said end bell for separately guiding and delivering the several air currents to predetermined portions of the machine. Y

4. The combination with a dynamo-electric machine provided with an end bell and a shaft extending therethrough, of a plurality of blowers associated with said shaft for producing air currents, a joint inlet passage to the said blowers and means secured within the said end bell for preventing initial diffusion of the several air currents.

5. The lcombination with a dynamo-electric machine provided with an end-bell and a shaft extending therethrough, of a plurality of blowers associated with the said shaft, means associated with the said end bell and disposed between the said blowers for guiding air from an exterior source of supply to the said blowers and further means for guiding and delivering the several air curlig'enlts separately to the interior of the end 6. The combination with a dynamo-electric machine provided with an end-bell and a shaft extending therethrough, of a plurality of blowers carried by said shaft for producing air currents, the said end-bell being subdivided to provide a joint inlet passage to said blowers and to provide independent passages from said blowers to different parts of said end-bell.

7. The combination with a dynamo-electric machine provided with an end-bell and a shaft extending' therethrough, of a plurality of blowers mounted on the said shaft and adapted to rotate therewith, a single air inlet channel communicating with both of the blowers, and means for guiding the air currents produced by the said blowers to the parts of the machine Vto be cooled without permitting interference between the air currents supplied to and delivered by the said blowers.

S. The combination with a dynamo-electric machine provided with an end-bell and a shaft extending therethrough, of a'blower mounted on the said shaft and adapted to rotate therewith, and to deliver air directly to the operating parts of the machine, a second blower also mounted on the same shaft and adapted to rotate therewith, joint means In testimony whereof, l have hereunto subscribed my name this 20th day of Feb. 1914.

J AN 'ARTHUR KUYSER.

`for Supplying nir to both of the Seid blowers, and means for conducting and delivering` the air delivered by the said second blower to portions of the machine adjacent t0 the parts supplied by the rst blower Without Witnesses: permitting interference between the :tir cur- R. D. BROWN, rents. B. B. HINES.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

